Engine and transmission unit.



E. A. NELSON. v ENGINE AND TRANSMISSION UNIT. APPLICATION 'F'ILED FEB. 19, 1912,

l fl 1,9510 Patented Ma1131, 19M.

To all whom timer concern: Be it known that I,

had therein to t e accompanying drawmgs'.

ing for a transmission gearing and also pref- TED TATES PATENT- OFFICE.

EMIL A. NELSON, or nn'raorr, MICHIGAN, ASSIG-NQB -ro. HUPP moron can conranv,

O13 MICHIGAN.

OF DETROIT, MIQ'HIGAN, A CORPORATION ENGINE 4minrnertsrnssronr nmr.

Patented Mar. .31, 1914.

Application filed February 19, 1912 Serial No. 618,672.

1,091,951, Specification of Letters Yatent.

- A is correspondingly enlarged to receive the .fly wheel as. indicated at L, and a further vertical extension M forms ,a housing for a from the crank shaft and a magneto indicated by dotted lines at N. This magneto is mounted upon a fiat top portion O of,the enlargement F and from this point the portion F inclines .downward at P so that its outer end trio with theaxis of the crank shaft.

The construction above. described is one which simplifies the en sion assembly asall of t e bearings for the crank shaft and'the transmission shaft .are in the integral member- A. Furthermore, this construction rovides access to all ofthe parts of the mec anis'm' contained therein, the member H being provided with a detachable bottom Q, and

,a removable lid R covering an aperture in the inclined portion P.

What I claim as my invention isi 1. The combination of a complete housing for the transmission gearing, a crank case member formed integral therewith, said crank case member having its lower edge in the plane of the crank shaft, and a complementary lower member for the crank case formed of sheet metal havin its upper edge conformingto theshape o the lower edge of said crank case member, and one of its ends complementary to the adjacent portion of the housing for the trans mission gearing.

2. The combination with an engine crank case member having the lower edge of the main portion in the'plane of the crank shaft, of an integral extension of said member forming a transmission glearing housing and extending below the pane of the crank shaft. p a 1 3; An en e crank case member having the lower edge of the body portion thereof in the plane of the crank shaft and an extension be ond said body portion and be low said p ane forming a transmission gear-. ing housing, said extension and body portion merging a curved connection portion.

EMIL A. NELSON, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in En gine and Transmission Units, of whichthe following is a s ecification, reference being drive train .The invention relates to engine construetions more particularly designed for use in motor vehicles and consists in the novel construction of the engine crank case, and fur ther in the combination thereof with a housing for the transmission gearing and forother engine accessories as hereinafter set. forth. I

In the drawings,--Figure 1 is a side e'levation; Fig. 2 is a cross section on line m--m- Fig. 1; Fig. 3 is a cross section online 31-31 Fig. 1. I

A is a member preferably formed of'cast metal such for instance as aluminum and which forms the upper section of a crank case for a rnulti-cyllnder engine unit such as indicated in dotted lines B. The lower edge of this member A is preferably in the horizontal plane of the crankshaft and a plurality of half bearings for said crank shaft are formed integral with the case,,pr eferably the three half bearings O, D and E. Beyond these bearings is an enlarged portion F of the member A which forms a houserably a housing for a drive mechanism for the magneto and a mounting for the latter. The portion F extends belowthe plane of the crank shaft to form the complete housing for the transmission and this downwardly projecting portion merges into the body portion by a curved intermediate ortion G, thereby avoiding any angles w ich would weaken the structure by localizing stresses. The crank case is completed by a lower section H formed of sheet metal and provided with flanges I for abutting against side flanges J on the member A, said flanges I being preferably extended to form a'pan extending to the side sills of the chassis. The member H is also curved to conform to the curved portion G of the member A and. is tapered from one end to the other so as to form an enlargement K in which the fly wheel for the engine is housed. lihe member portion havin prising a body of the crank s aft, and an edge'in the plane curving downward below the etc housing is symmetrical or concenine and transm1s-- the member A with 4. An engine crank case member comits lower integral extension beyond said body portion" for a transmission gearing, and a complementary member for said crank case having a portion correspondingly curved.

5. An engine crank case member having a body portion with its lower edge in the plane of the crank shaft, and an integral extension beyond said body portion curving downward below the plane of the crank shaft to form the complete housing for a transmission gearingin combination with a complementary member for the crank c'ase housing formed of sheet metal and having its upper edge conforming to the shape of ghe lower edge of said first mentioned memer. 6. An engine crank case member comprising a body ortion having its lower edge in the planeof the crank shaft, and an integral extension beyond said body portion and below the plane of the crank shaft to form the complete housing for an alined transmission shaft and transmission gearing in combination with a,, complementary member for the crank case conforming to the shape of the lower edge of said first mentioned member and the downward extension thereof.

An enginecrank casemembercompris 7 ing a body portion having its lower edge in the plane of the crank shaft with integral half bearings thereon for the crank shaft, and an inte al extension beyond said body portion and below the plane of the crank V integral bearings for the transand the transmission gearing.

said tapering portion extending below the plane of the crank shaft and being pro vlded with integral bearings for the transmission shaft and gearing." An engine crank case member comprising a body portion having its lower edge in the plane of the crank shaft, and an mte- 1 gral extension beyond said body portion,

having an enlargement. forming thefiywheel housing, and a tapering port on extending the plane of the crank shaft and form-, ing a housing for the transmission shaft'and below transmission gearing, said enlarged poi-tion forming a mounting fora magneto .and'ijbeing provided with a portion forming a housing. for a magneto drive.

In testimony whereof I afiix my signature in presence of two witnesses.

EMIL A. NELSON. Witnesses: Y

- FRANK E. WAI'IS,

GRANVILLE C. ALDRICH. 

